Final answer:
The total mass of the object measured with a triple beam balance, which has readings of 300 grams, 60 grams, and 8.2 grams, is 368.2 grams.
Step-by-step explanation:
To determine the total mass of an object using a triple beam balance, you need to add the mass readings from all three beams together. In this case, one beam reads 300 grams, another reads 60 grams, and the third beam reads 8.2 grams. Adding these values together gives:
300 + 60 + 8.2 = 368.2 grams.
Therefore, the total mass of the object is 368.2 grams.